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Opel Zafira 1.8 125KM Check Indicator: Coolant Alert & Low Temperature (Photo Included)

andzej789 7725 17
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Why does my Opel Zafira show a low coolant warning and a temperature that seems too low, especially above 120 km/h, even though the coolant level looks okay?

Read the fault codes with a diagnostic tool first, because the thread does not support guessing from the warning light alone [#17230639] The coolant temperature can look lower while driving; one reply says to warm the engine while stationary, because when moving the temperature will drop even if the radiator fan is running [#17230959][#17231055] The later warning turned out to be about brake pad wear, not coolant: the sensors are mounted on the brake pads and the connector should plug into them [#17239604][#17240151] If the car has pads without the sensor setup, the system can still complain because the pads must be the sensor-equipped type [#17240193] A broken cable at the pad/block can also trigger the message [#17236702]
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  • #1 17230580
    andzej789
    Level 13  
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    Hello, while driving, the check light on the board and on the display came on and the message too little coolant. This surprised me as the fluid level was not in a dire condition.
    The fluid has been refilled, the check is still lit. I noticed that the fluid level message appears above 120km / H. And I think it keeps the temperature too low. I'm throwing a photo. Do you advise or for a computer.
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    • Opel Zafira 1.8 125KM Check Indicator: Coolant Alert & Low Temperature (Photo Included) 20180519_195106.jpg (3.61 MB) You must be logged in to download this attachment.
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  • #2 17230639
    Pedros050
    Level 43  
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    Hello. Connect it to a diagnostic device and read errors.
  • #3 17230901
    andzej789
    Level 13  
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    And the temperature of the liquid should not be higher ???
  • #4 17230907
    Pedros050
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    And a photo taken on a hot engine? Has the fan cooled down to this temperature?
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  • #5 17230939
    andzej789
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    On a warm one after driving 15 km
  • #6 17230959
    Pedros050
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    Warm up the engine while stationary, because when driving, the temperature will always drop even when the fan on the radiator is running.
  • #7 17231055
    maly_13
    Level 20  
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    temperature ok (I have too)
    reading error codes because otherwise they are reading coffee grounds.
  • #8 17234036
    andzej789
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    In addition, a new message popped up, I throw a photo. I know that means little cladding on the blocks - although the blocks are thick.
    Attachments:
    • Opel Zafira 1.8 125KM Check Indicator: Coolant Alert & Low Temperature (Photo Included) 20180522_084157.jpg (5.12 MB) You must be logged in to download this attachment.
  • #9 17234772
    andzej789
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    I connected to the computer ... it turned out that the first probe ... a mixture sometimes rich and sometimes poor ...
    The probe has already been replaced ....
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  • #10 17236702
    g107r
    Level 41  
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    And it shouldn't be like that? Rich, poor, rich, poor ...?
    How does a lambda probe work?
    andzej789 wrote:
    In addition, a new message popped up, I throw a photo. I know that means little cladding on the blocks - although the blocks are thick.
    Of the simplest ones, with thick blocks it can also mean a broken cable from the block.
  • #11 17237249
    andzej789
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    This is what the rich displayed on the computer and then the poor.
    Well, today the check light came on again ..
  • #12 17239107
    andzej789
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    I checked the wires in the front wheels are whole. I do not see the interruption or other faults ... there are also sensors on the back ?? photo ... Opel Zafira 1.8 125KM Check Indicator: Coolant Alert & Low Temperature (Photo Included) Opel Zafira 1.8 125KM Check Indicator: Coolant Alert & Low Temperature (Photo Included)

    Added after 11 [hours] 28 [minutes]:

    Is it a pad wear cable?
    Attachments:
    • Opel Zafira 1.8 125KM Check Indicator: Coolant Alert & Low Temperature (Photo Included) 20180524_191927.jpg (1.18 MB) You must be logged in to download this attachment.
  • #13 17239604
    Pedros050
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    Yes. Exactly.
  • #14 17239975
    andzej789
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    And where to connect them ... there will be a place for the terminals ??
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  • #15 17240151
    Pedros050
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    The sensors are on the brake pads and the plug should be plugged in there.
  • #17 17240189
    andzej789
    Level 13  
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    But it should be the input in the blocks ?? So some special ??
  • #18 17240193
    Pedros050
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    The blocks for the sensors must be there.
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Topic summary

✨ The discussion revolves around an Opel Zafira 1.8 experiencing a check indicator light and a coolant alert despite the fluid level being adequate. Users suggest connecting the vehicle to a diagnostic device to read error codes, as the temperature readings appear low. The author mentions a new error related to the lambda probe, indicating fluctuating fuel mixture readings. Further troubleshooting includes checking wiring and sensors related to brake pads, as well as ensuring proper connections for the sensors. The conversation emphasizes the importance of diagnosing error codes and inspecting related components to resolve the issues.
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FAQ

TL;DR: Zafira 1.8 may show coolant warning at 120 km/h; "Connect it to a diagnostic device" before guessing. For owners fixing coolant alerts, low temp readings, pad‑sensor messages, and CELs. Scan, warm stationary, and inspect pad‑sensor wiring. [Elektroda, Pedros050, post #17230639]

Why it matters: Quick, evidence‑based checks prevent overheating, restore brake safety alerts, and stop repeat Check‑Engine cycles.

Quick Facts

Why did my Zafira show “Too little coolant” but the tank isn’t empty?

Start by scanning for fault codes. That confirms if the coolant level sensor misread or another system raised the alert. Clear codes, road‑test, and recheck. "Connect it to a diagnostic device and read errors." [Elektroda, Pedros050, post #17230639]

Should the temperature gauge be higher after a 15 km drive?

Verify temperature at idle rather than while cruising. Airflow while driving can lower the indicated temperature significantly. "Warm up the engine while stationary." If the gauge stabilizes at normal when idling, the system likely works correctly. [Elektroda, Pedros050, post #17230959]

Is the temperature in the photo normal for the 1.8 petrol?

Yes. Owners report that gauge position as normal for this engine. Focus on reading codes to avoid guesswork. "reading error codes because otherwise they are reading coffee grounds." [Elektroda, maly_13, post #17231055]

What does the brake pad symbol mean if my pads look thick?

It indicates the brake pad wear circuit triggered. With thick pads, a broken or disconnected sensor cable can also cause the warning. Inspect the pad‑wear lead and connector at the caliper. Replace or reconnect as needed. [Elektroda, g107r, post #17236702]

Is this cable near the caliper the pad‑wear lead?

Yes. That two‑wire lead is the pad‑wear sensor cable. Replace damaged sections and ensure the connector seats correctly. [Elektroda, Pedros050, post #17239604]

Where do I connect the pad‑wear sensors?

Into the brake pads. The harness plug mates with the sensor that clips into the pad’s recess. Trace the cable from the caliper to find the connector location. [Elektroda, Pedros050, post #17240151]

Do my pads need a special slot for the sensor?

Yes. Choose pads designed for wear sensors. Pads without sensor slots cannot accept the sensor and will not report wear. Check pad specs before buying. [Elektroda, Pedros050, post #17240193]

How do I read fault codes on a Zafira without guessing?

Use an OBD‑II scanner to read codes and avoid guessing.
  1. Plug the scanner into the diagnostic port.
  2. Read stored and pending codes, plus freeze‑frame data.
  3. Clear codes, drive to reproduce, and rescan to confirm fixes. [Elektroda, Pedros050, post #17230639]

My upstream lambda shows rich then lean. Is that normal?

Yes. The upstream oxygen sensor should switch around stoichiometric repeatedly at hot idle. Typical switching is about 1–2 times per second. A flat or slow trace indicates a fault. Confirm heater operation and wiring continuity if switching is abnormal. [Bosch, 2018]

I replaced the first O2 sensor but the Check Engine returned. What next?

Scan again and review codes and fuel trims. The original fault may be elsewhere, like wiring, exhaust leaks, or intake leaks. The light returned after replacing the first probe in this case. Verify with diagnostics before replacing more parts. [Elektroda, andzej789, post #17237249]

Can driving keep this engine’s temperature reading low?

Yes. Road airflow cools the radiator and can hold the gauge lower, even with the fan running. Check temperature at idle to confirm thermostat performance. [Elektroda, Pedros050, post #17230959]

Is there a visual guide for brake pad wear sensor routing?

Yes. See the shared guide for Opel brake systems. It shows pad wear sensor placement and routing, useful when refitting connectors. [Elektroda, g107r, post #17240185]
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